Anatomy of straight vs meandering fluvial channels in Triassic red beds of S Spain and W Morocco. Implications as reservoir rocks. / Viseras, César; Fernández Martínez, Juan; Henares, Saturnina; Pla Pueyo, Sila.

2011. 107 Abstract from 28th IAS Meeting of Sedimentology, Zaragoza, Spain.

Research output: Contribution to conferenceAbstract

Published

Standard

Anatomy of straight vs meandering fluvial channels in Triassic red beds of S Spain and W Morocco. Implications as reservoir rocks. / Viseras, César; Fernández Martínez, Juan; Henares, Saturnina; Pla Pueyo, Sila.

2011. 107 Abstract from 28th IAS Meeting of Sedimentology, Zaragoza, Spain.

Research output: Contribution to conferenceAbstract

Harvard

Viseras, C, Fernández Martínez, J, Henares, S & Pla Pueyo, S 2011, 'Anatomy of straight vs meandering fluvial channels in Triassic red beds of S Spain and W Morocco. Implications as reservoir rocks', 28th IAS Meeting of Sedimentology, Zaragoza, Spain, 5/07/11 - 8/07/11 pp. 107. <http://www.sedregroup.com/>

APA

Viseras, C., Fernández Martínez, J., Henares, S., & Pla Pueyo, S. (2011). Anatomy of straight vs meandering fluvial channels in Triassic red beds of S Spain and W Morocco. Implications as reservoir rocks. 107. Abstract from 28th IAS Meeting of Sedimentology, Zaragoza, Spain. http://www.sedregroup.com/

Vancouver

Viseras C, Fernández Martínez J, Henares S, Pla Pueyo S. Anatomy of straight vs meandering fluvial channels in Triassic red beds of S Spain and W Morocco. Implications as reservoir rocks. 2011. Abstract from 28th IAS Meeting of Sedimentology, Zaragoza, Spain.

Author

Viseras, César ; Fernández Martínez, Juan ; Henares, Saturnina ; Pla Pueyo, Sila. / Anatomy of straight vs meandering fluvial channels in Triassic red beds of S Spain and W Morocco. Implications as reservoir rocks. Abstract from 28th IAS Meeting of Sedimentology, Zaragoza, Spain.1 p.

BibTeX

@conference{68c6acad2e5c4aa69f2e2f9fabaeff43,
title = "Anatomy of straight vs meandering fluvial channels in Triassic red beds of S Spain and W Morocco. Implications as reservoir rocks",
abstract = "Two successions of Triassic red beds developed in a continental rift tectonic setting have been studied. Oneof them is located in the tabular cover of the Iberian Meseta, Spain (TIBEM) and the other in the western end ofthe High Atlas, Morocco (THATLAS). Among the most characteristic architectural elements of both successionsare sandy sedimentary bodies resulting from the dynamics of meandering and straight channels.Deposition in meandering channels can lead to the formation of sedimentary bodies of high lateral extent (upto 400-500 m). However, in the two studied examples we found that under high subsidence or rising base levelconditions, frequent avulsion processes have resulted in the development of ribbon-type bodies with similargeometry to that of the straight channels (2-4 m thick lenses with 30-60 m of lateral continuity). Both types ofchannels can therefore be easily confused in exploration geology.The bodies generated by the dynamics of meandering channels consist of three elements corresponding tothe sub-environments of point bar, sinuous channel and chute channel. The point bar displays the lateralaccretion units with epsilon cross-bedding and irregularities at the top due to scroll bars and swell depressionsbetween them. The sand layers of the lateral accretion units (thickness between 10 and 30 cm) showinterbedding of centimetric clay levels deposited at times of inactivity of the bar. The sinuous channel is filled byrippled sand that alternates with settling of lutite. The chute channels have a similar behaviour to that of braidedor straight channels.The straight channels show a characteristic expansion wing towards the top. Their filling occurs in severalphases related to flow regime fluctuations, giving way to the development of megarriples and scouring surfaces.The abandonment phase produces climbing ripples and a large proportion of shaly sediment.As they may result in reservoirs of similar size and shape, the differentiation between both types of bodiesfrom subsurface data may have an important implication from the exploration point of view. The bodiesgenerated by high sinuosity fluvial dynamics present their most porous facies in the lateral accretion units of thepoint bars, although the clay beds developed during inactivity times can act as barriers to the movements offluids. The sand bodies related to straight channels behave as more homogeneous reservoirs, with much moreporous facies at the lower part and a less porous top transitioning to the seal, represented by the overlyingoverbank fines.",
keywords = "fluvial, Triassic, Morocco, Spain, red beds, Reservoirs",
author = "C{\'e}sar Viseras and {Fern{\'a}ndez Mart{\'i}nez}, Juan and Saturnina Henares and {Pla Pueyo}, Sila",
year = "2011",
language = "English",
pages = "107",
note = "28th IAS Meeting of Sedimentology ; Conference date: 05-07-2011 Through 08-07-2011",

}

RIS

TY - CONF

T1 - Anatomy of straight vs meandering fluvial channels in Triassic red beds of S Spain and W Morocco. Implications as reservoir rocks

AU - Viseras, César

AU - Fernández Martínez, Juan

AU - Henares, Saturnina

AU - Pla Pueyo, Sila

PY - 2011

Y1 - 2011

N2 - Two successions of Triassic red beds developed in a continental rift tectonic setting have been studied. Oneof them is located in the tabular cover of the Iberian Meseta, Spain (TIBEM) and the other in the western end ofthe High Atlas, Morocco (THATLAS). Among the most characteristic architectural elements of both successionsare sandy sedimentary bodies resulting from the dynamics of meandering and straight channels.Deposition in meandering channels can lead to the formation of sedimentary bodies of high lateral extent (upto 400-500 m). However, in the two studied examples we found that under high subsidence or rising base levelconditions, frequent avulsion processes have resulted in the development of ribbon-type bodies with similargeometry to that of the straight channels (2-4 m thick lenses with 30-60 m of lateral continuity). Both types ofchannels can therefore be easily confused in exploration geology.The bodies generated by the dynamics of meandering channels consist of three elements corresponding tothe sub-environments of point bar, sinuous channel and chute channel. The point bar displays the lateralaccretion units with epsilon cross-bedding and irregularities at the top due to scroll bars and swell depressionsbetween them. The sand layers of the lateral accretion units (thickness between 10 and 30 cm) showinterbedding of centimetric clay levels deposited at times of inactivity of the bar. The sinuous channel is filled byrippled sand that alternates with settling of lutite. The chute channels have a similar behaviour to that of braidedor straight channels.The straight channels show a characteristic expansion wing towards the top. Their filling occurs in severalphases related to flow regime fluctuations, giving way to the development of megarriples and scouring surfaces.The abandonment phase produces climbing ripples and a large proportion of shaly sediment.As they may result in reservoirs of similar size and shape, the differentiation between both types of bodiesfrom subsurface data may have an important implication from the exploration point of view. The bodiesgenerated by high sinuosity fluvial dynamics present their most porous facies in the lateral accretion units of thepoint bars, although the clay beds developed during inactivity times can act as barriers to the movements offluids. The sand bodies related to straight channels behave as more homogeneous reservoirs, with much moreporous facies at the lower part and a less porous top transitioning to the seal, represented by the overlyingoverbank fines.

AB - Two successions of Triassic red beds developed in a continental rift tectonic setting have been studied. Oneof them is located in the tabular cover of the Iberian Meseta, Spain (TIBEM) and the other in the western end ofthe High Atlas, Morocco (THATLAS). Among the most characteristic architectural elements of both successionsare sandy sedimentary bodies resulting from the dynamics of meandering and straight channels.Deposition in meandering channels can lead to the formation of sedimentary bodies of high lateral extent (upto 400-500 m). However, in the two studied examples we found that under high subsidence or rising base levelconditions, frequent avulsion processes have resulted in the development of ribbon-type bodies with similargeometry to that of the straight channels (2-4 m thick lenses with 30-60 m of lateral continuity). Both types ofchannels can therefore be easily confused in exploration geology.The bodies generated by the dynamics of meandering channels consist of three elements corresponding tothe sub-environments of point bar, sinuous channel and chute channel. The point bar displays the lateralaccretion units with epsilon cross-bedding and irregularities at the top due to scroll bars and swell depressionsbetween them. The sand layers of the lateral accretion units (thickness between 10 and 30 cm) showinterbedding of centimetric clay levels deposited at times of inactivity of the bar. The sinuous channel is filled byrippled sand that alternates with settling of lutite. The chute channels have a similar behaviour to that of braidedor straight channels.The straight channels show a characteristic expansion wing towards the top. Their filling occurs in severalphases related to flow regime fluctuations, giving way to the development of megarriples and scouring surfaces.The abandonment phase produces climbing ripples and a large proportion of shaly sediment.As they may result in reservoirs of similar size and shape, the differentiation between both types of bodiesfrom subsurface data may have an important implication from the exploration point of view. The bodiesgenerated by high sinuosity fluvial dynamics present their most porous facies in the lateral accretion units of thepoint bars, although the clay beds developed during inactivity times can act as barriers to the movements offluids. The sand bodies related to straight channels behave as more homogeneous reservoirs, with much moreporous facies at the lower part and a less porous top transitioning to the seal, represented by the overlyingoverbank fines.

KW - fluvial

KW - Triassic

KW - Morocco

KW - Spain

KW - red beds

KW - Reservoirs

M3 - Abstract

SP - 107

T2 - 28th IAS Meeting of Sedimentology

Y2 - 5 July 2011 through 8 July 2011

ER -